231783728279 has 2 divisors, whose sum is σ = 231783728280. Its totient is φ = 231783728278.

The previous prime is 231783728251. The next prime is 231783728287. The reversal of 231783728279 is 972827387132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231783728279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231783758279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115891864139 + 115891864140.

It is an arithmetic number, because the mean of its divisors is an integer number (115891864140).

Almost surely, 2^231783728279 is an apocalyptic number.

231783728279 is a deficient number, since it is larger than the sum of its proper divisors (1).

231783728279 is an equidigital number, since it uses as much as digits as its factorization.

231783728279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14224896, while the sum is 59.

The spelling of 231783728279 in words is "two hundred thirty-one billion, seven hundred eighty-three million, seven hundred twenty-eight thousand, two hundred seventy-nine".